Official website: kalumajs.org

Kaluma is a tiny and efficient JavaScript runtime for RP2040 (Raspberry Pi Pico). The main features are:

• Small footprint. Runs minimally on microcontrollers with 300KB ROM with 64KB RAM.
• Support modern JavaScript standards (ECMAScript 5/6/6+). Powered by JerryScript.
• Has internal event loop like as Node.js for asynchronous.
• Has built-in modules including file systems (LittleFS, FAT), graphics, networking and more.
• Support RP2's PIO (Programmable I/O) assembly embeddable in JavaScript code.
• Provides very friendly API that resembles Node.js and Arduino.